Effect of Caron Nanofiber on Melt-crystallization Behavior of Polyketone 


Vol. 53,  No. 4, pp. 257-263, Aug.  2016
10.12772/TSE.2016.53.257


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  Abstract

We report the influences of carbon nanofiber (CNF) on the melt-crystallization behavior and structures of polyketone (PK) composites, which were manufactured by a solution blending process. For this purpose, melt-crystallization experiments of neat PK and its composites, including 0.5 and 1.0 wt% CNFs, were carried out at different isothermal temperatures by using a differential scanning calorimeter and the results were analyzed using the Avrami equation. For all neat PK and PK/CNF composites, the Avrami index n remained unchanged, regardless of the isothermal crystallization temperatures (Tc), whereas the rate constant K and the inverse of crystallization half-time (t1/2-1) increased noticeably with decreasing Tc’s, indicating faster melt-crystallization rates at lower Tc’s. It was further revealed that the melt-crystallization rates of PK/CNF composites were far greater than those of neat PK owing to the nucleating effect of CNF to the meltcrystallization of PK and that the composite with 1.0 wt% CNF exhibited slightly better crystallization rates, compared to the composite with 0.5 wt% CNF. Polarized optical microscopic images and X-ray diffraction patterns also support that CNF contributes to accelerate the melt-crystallization rates of PK without influencing the crystal structure of PK β-form.

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pISSN : 1225 - 1089
eISSN : 2288 - 6419

한국연구재단 우수등재학술지 유지 (2022년)